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MINERALOGICAL STUDIES OF THE HYDROTHERMAL SYSTEM IN NEWBERRY VOLCANO DRILL HOLE 2, OREGON.

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Abstract

Studies of secondary mineral distribution, whole-rock chemical compositions, isotopes, and fluid inclusions are being conducted on the core from Newberry Volcano drill hole 2. Rocks from the drill core are divided into 3 major intervals on the basis of their alteration pattern, which is controlled by rock permeabilities, primary lithologies, and temperatures. Incomplete alteration of pumice-rich lithic tuff layers in the upper part of the altered section and lack of self-sealing in fractures of most lava flows suggest that the hydrothermal system is young. Most of the secondary minerals could have been formed at temperatures near those present today; maximum measured temperature was 265 degree C at the bottom of the hole. Fluid inclusions indicate that past temperatures in the deeper part of the drill hole may have been as much as 100 degree C hotter than presently measured temperatures.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title MINERALOGICAL STUDIES OF THE HYDROTHERMAL SYSTEM IN NEWBERRY VOLCANO DRILL HOLE 2, OREGON.
ISBN 0934412588
Volume 8
Year Published 1984
Language English
Publisher Geothermal Resources Council
Publisher location Davis, CA, USA
Larger Work Title Transactions - Geothermal Resources Council
First page 125
Last page 128
Conference Title Geothermal Energy: Bet on It! Geothermal Resources Council 1984 Annual Meeting.
Conference Location Reno, NV, USA
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